﻿namespace Haidou.Wpf.Native
{
	public static class Delegates
	{
		/// <summary>
		/// Callback delegate which is used by the Windows API to submit window messages.
		/// </summary>
		public delegate IntPtr WindowProcedureHandler(IntPtr hwnd, uint uMsg, IntPtr wparam, IntPtr lparam);

		public delegate bool MonitorEnumProc(IntPtr monitor, IntPtr hdc, IntPtr lprcMonitor, IntPtr lParam);

		public delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

		/// <summary>
		/// The CallWndProc hook procedure is an application-defined or library-defined callback 
		/// function used with the SetWindowsHookEx function. The HOOKPROC type defines a pointer 
		/// to this callback function. CallWndProc is a placeholder for the application-defined 
		/// or library-defined function name.
		/// </summary>
		/// <param name="nCode">
		/// [in] Specifies whether the hook procedure must process the message. 
		/// If nCode is HC_ACTION, the hook procedure must process the message. 
		/// If nCode is less than zero, the hook procedure must pass the message to the 
		/// CallNextHookEx function without further processing and must return the 
		/// value returned by CallNextHookEx.
		/// </param>
		/// <param name="wParam">
		/// [in] Specifies whether the message was sent by the current thread. 
		/// If the message was sent by the current thread, it is nonzero; otherwise, it is zero. 
		/// </param>
		/// <param name="lParam">
		/// [in] Pointer to a CWPSTRUCT structure that contains details about the message. 
		/// </param>
		/// <returns>
		/// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx. 
		/// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx 
		/// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC 
		/// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook 
		/// procedure does not call CallNextHookEx, the return value should be zero. 
		/// </returns>
		/// <remarks>
		/// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/callwndproc.asp
		/// </remarks>
		internal delegate IntPtr HookProc(int nCode, uint wParam, IntPtr lParam);
	}
}
